Cubed Root: Find the prime factors of the number under the radical; look for groups of 3 of the same number, like 3 - 2's (cubed root of 8) to take out of the radical; if negative, can factor out the -1
Cute idea... good way to get them to learn square roots without them knowing it because they know the numbers under the post its! It is very inexpensive and not at all time consuming to make. The only problem I can think of with this would be the postit notes loosing their ability to stick onto the clock's face.
$ CCSS 8.NS.1 & 8.NS.2 - Irrational and Rational Numbers Stations (20 Problems); Topics: Approximate Irrational Numbers (square roots); Complete a table of squares or square roots; graph rational and irrational numbers on the number line; order rational and irrational numbers (including square roots) from least to greatest; determine whether numbers are rational or irrational; defining rational and irrational numbers; show examples of rational and irrational numbers